A Troll is a magical creature of prodigious strength and immense stupidity. In fact, they are so stupid that they actually had a wizarding exam failing grade named after them. Trolls generally reach a height of about twelve feet and weigh up to nearly a ton. They are dangerously violent and incredibly aggressive, and then engage in unpredictable behaviour; a bit comparable with giants. Trolls originated in Scandinavia, but are now found all across Europe. Trolls feed on raw flesh, and are not that fussy about what they eat, from animals to even humans.

Artemius Lawson was an outspoken advocate for the strict restraint of trolls. He thought it was wrong to allow them to roam free, stating that "they were creatures who weighed a ton, but had brains the size of a bogey".

Sub-species

There are three different types of Troll, each with its own highly unique set of physical differences.

Harry Potter once speculated that Marcus Flint has some traces of Troll blood in him; however, this might be simply to insult Flint's stupidity and appearance.

When Ron Weasley was captured by Snatchers in 1997, he told them he was Stan Shunpike, due to them not looking very intelligent, and even speculated that one of them might have been part-Troll, judging by his odour.